Types of isolated footing and design

isolated footing and design

1. Elementary Structural Design Topic : Types of isolated footing and design

2. Definition: Footings are structural members used to support columns and walls and to transmit and distribute their loads to the soil in such a way that the load bearing capacity of the soil is not exceeded, excessive settlement, rotation are prevented and adequate safety against overturning or sliding is maintained.

3. Types of isolated column Footing Pad footing Sloped footing

4. Steps for Design of isolated footing Size of footing Net upward Pressure Bending Moment Depth of footing Reinforcement Check for one-way shear Check for two-way shear Check for development Length Load transfer for column to footing

5. Example: Design an isolated square footing for a square column 400mm*400mm for axial load of 800kn.Use concrete grade M-20 and Fe-250 steel grade. Take safe bearing capacity of soil 120kn/m².Check for shear is not required. Also draw neat sketch showing sectional elevation and plan.

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